Disk brake mechanism



May 26, 1959 c. L. EKsr-:RGIAN ETAL 2,888,102

DISK BRAKE MECHANISM Filed Aug. 30,l 1956 '7 Sheets-Sheet 1 58 57 FIG@ 57 v 55% 65 56 64 5o 67 L 4 v Q A52 Q f311/30 i I M i.. 32

l u J L i 7@ 7F i m\ n 5i 60 7 1, L l l l) h. f @61617 S3 QJLQM INVENTORS 63 Q Carolus L. Eksergian Edwin K. Buye 62 ATTORNEY May 26, 1959 c. L. EKSERGIAN ET AL 2,888,102

DISK BRAKE MECHANISM Filed Aug. 30, 1956 7 Sheets-Sheet 3 INVENTORS Carolus L EKSergan Edwin K. Buyge B? gli/Mmm ATTORNEY May 2.6, 1959 c. L. EKSERGIAN ET AL 2,888,102

DISK BRAKE MECHANISM INVENTORS Caolus LEKSerqan Edwin K. Buye ATTORNEY c. L.. EKSERGIAN ET AL 2,888,102

May 26, 1959 DISK rBRAKE MECHANISM 7 sheets-sheet 5 Filed Aug. 50, 1956 FIG. 7l

INVENTORS Carolus L. Eksergan Edwin K. Buy/.e

Wm T,

ATTORNEY May 26, 195,9 c. L. EKSERGIAN ET AL 2,888,102

- DISK BRAKE MECHANISM Filed Aug. 30', 1956 7 SheetS-Sheet 6 iO i0 INVENTORS Carolus L. Eksergian Edwin K. Buyge ATTORNEY May 26, 1959 Filed Aug. 30. 1956 C. L. EKSERGIAN ET AL DISK BRAKE MECHANISM 7 Sheets-Sheet '7 Carolus Lfksergian. Edwin K. Buyge ATTORNEY INVENTORS UnitedStates PatChtO 2,888,102 l I f f. DISKBRAKE MECHANSM Carolus I`..k sergia1,.Media, Pa., and'Edwin K. YBuyze,

St. Clair Shores, `Mich., assignors to The Budd Company, Philadelphia', Pa.`, a corporation of Pennsylvania .-Appn'eatin August 30, 19s6, seria1N0. 607,041

" f' scams. (C1.18s7z) tanism,'tinproved means lfor.l 'applyingwthe brakes, and 'in 'addition'to provide automatici-wear adjustment mech- Aanisr'n' and auxiliaryhand operating mechanism.v l

The-objects and advantagesof theinventionwill .be #apparent 'from the following'des'cription. of an exemplary embodiment, referencebeing made to the accompanying drawings thereof wherein: s -r y n v Fig. 1 isai vertical elevation and section of an auto- "rnobile wheel Eassembly' takenA inside the wheel` looking fjou'twardfth'e'view-being-taken on they line 1--1 of Fig. 2;

Fig. 2 is an enlargedv axial section taken on theicline v'2-2'ofFigpl;v f s .t

Fig. 3 is an lenlarged axial section taken on thelline -Of ..5 v

the wheel".I

' Fig. 4"is"avertical section and elevation taken-'on the F1g.5 is af-verticalsection and-.e ovation' taken on' the Figi 10 Etain-elevation, with "the cover and'other 'parts the'brake disk 30, The outer-brake shoesS inserts- 55 and 56-t o cooperate with the hardened spherical otherinsert 55 has a semi-cylindrical concavity. The inner brake shoes 51 are providedwith hardened 2,888,102 ,Patented May 2 6, 1959 base includes an innerannularflange 43s'ecured to the vattachedplate portion as by arc welding indicated .at 44.

The `plate and flanges 43 are liattened at the top, as

-shown in Figs; 4 and 5, and upon this attened surface there is secured;` as by arc welding 45, a trunnion support l 46... Trunnion pins 47 are threaded into the ends of the support 46 and haveturnably mountedon them the bearing projections 48 of-a Isl-shaped brake supporting frame 4 9. The inner andouter branches or furcations 49aand;y 49b :of the U-shaped` framer 49 haveother Thel shoes. carry non-metallic; composition brake linings 5 2l adapted to act 'against the annular braking surfacesof are provided with hardened ends .of adjustable; backing members 57 .which are threaded in tapped holes 58 of the secondary fureations 7 49a1 and 49a2. One of the inserts, as thetrailing one 56 for normal forward rotation, has a spherical cavity to t the spherical end of a backing member 57 andthe inserts 60 having cam or ramp grooves to receive backing balls 61.whichactagainst ramp grooves of hardened inserts 62, 63 carried'by the secondary furcations 49121. and

49b2. One of the inserts, yas the leading one 62, has a conical seat instead of circumferentially aligned ramp grooves which are provided elsewhere andis threaded to whichfy engages aredsplierical .seatson the piston and @Vv-Fig. 112I isra'nfend' elevation taken on=thefline-v12fl12 Asbest wh inVFig 2, a wheel 20,'com'prising arfdr'op "te nier-'rim i a''dsk 22, isse'cur/e/d'to theflange 23 of ahub 24' y bolts 25. In the"embodimentselecteda I'g. '15: is l'afsectioizt''taken on theline TIS-lili'ofFig. 14.-

' jrear'wheelfis'shown and the is formed int e'g'r allyf.l

A brake vdisc 30, eomprising braking lsurface bodies 31 spaced apart by webs 32 for air circulation, is secured by .bolts 3310 a.spid er 34,'the spider ybeing secured to theV i The :operation: of the mechanism yas thus Lplainetlintlie patents referred to above. -f-The brakes may be adjusted by hand addition t'hereare providelautomatic means for .taking provide adjustment to evenjup the shoe. The conical 1 seat acts as va ramp and 4also allows the gyballvto. move Hlaterally in its central. position., v

The shoes 50 and 51fareheldin normal spread-apart yposition by coil torsion springshgil. and-6 5 which have their c oilportions mounted` on retaining -screw posts 66 carried,.-.by,the sides of the .primary furcations 49a and 49h and their ends secured in .loops 67 on the .backs of the shoes S0, 51. The central parts of the springs aroh to clearthelheads of thetrunnionpins 47, as bestshown in Figs. 3 and .7 .A v

The rear spring 65, with.regardV to. normal forward yrotation, is. made slightly strongerthan the frontspring 64 so thatthe rear ends of the shoes will engage slightly later than the forward ends to ease the action and, avoid slap.`

Thebrake shoes are caused to engage withy the disk .by

i' a fluid actuated power device 70, comprising cylindery v' 711 secured to they U- shaped brake frame 49 by cap screws-'7 2 and sa, piston 73 acting en a spherical-ended push rod '74 inner-,shoe 51, respectively. L J A flexible dust shield kis arrangedfover the open er1 d ofthe cylinder.

A far described isas follows: Al/,hen .the power device is energized it i,pushes the inner shoe :51. againstfthe'disk, frontend first because of the weakerspringgandfthe conical seat ogn ,..thetronh and the rleaction'oll the power device tilts the {4U-shaped .brake frame onfitstrunnio'ns -and vcauses'the outer shoe'to engagel `the brake, disk. Actually, except'fr .,frictioriinipo-sed.in the .-'trunnions and frictionadded by'a f.tri'inn'ioii spring washer, 76v (Iii'g. 5), the-.two shoes'V ould engage' at practically the same time.

, When the inner shoe engages i t,.i s, movedforwjard by 65 f ric'tion,land. fthis impart'sa'self-energizing action asf exfor wearv but uplfor brake lining wear,` These. meansv provide. adjust- .iiient' the smallest possibleincrements.. by friction ,ratchet action and alsopro de complete t qUfaIZediadjustfient at both ends' of the shoe by a dual adjustment arrangement. The adjustment is provided by the movement of onel shoe relative to the other, in the illustrated form relative circumferential movement being used.

Specifically, as shown in Figs. 9 and lO, a gear 80 is secured to each of the two adjustment screws 57 of the outer shoe 50 and by idler gears 81 the screw attached gears 80 are connected toa central gear 82 secured on a shaft 83 of a friction clutch unit 84. An outer drive sleeve 85 is mounted on the shaft 83 and through friction rolls S6 drives 'a polygonal surfaced sleeve 87 fast on shaft 83 and through the shaft turns the gear 82. One arm 88 of the outer sleeve 85 provides the turning action and another arm 89 stops against an adjustment cam 90, a spring 9'1 urging the outer sleeve in the return direction. lt also holds sleeve 85 in position axially. A lever 92 pivoted intermediate its length on a pivot pin 93 carried by a member 94 mounted on the U-frame 49 (Fig. 5) has one end 92a (Fig. 4) located operatively adjacent the arm 88 of the ratchet device and the other end 92b (Fig. 9) located operatively adjacent a projection 95 of the inner shoe 51 so that when the shoe moves circumferentially beyond a normal brake-application distance because of lining Wear the ratchet device will be operated and the two adjustment screws 57 turned up.

Axial travel of the shoe could also be used to` adjust for lining wear by suitable alteration of the lever actuating means.

The inner side of the wheel-brake assembly is closed by a cover or shield 98 secured to the support ange 43 by cap screws 99, the inner edge being formed with an annular groove 98a to form a labyrinth seal with an annular ange 100 press tted and indented on the inner body portion 31 of the rotary brake disk 30. The cover shield is provided With openings 101 for air circulation (Fig. 2).

A hand operated parking brake arrangement is incorporated for actuating the brakes apart from fluid power operation. This arrangement comprises, Figs. 6 and 7, a thin sleeve 103 turnably mounted on a support on the U-shaped frame 49, here the support being the insert 63 having the ball ramp seat, and provided with a cam 104 for acting against a cam surface 105 of the inner shoe 51, the cam surfaces being suitably formed as to accommodate the necessary circumferential movement between the shoe and its backing parts if required.

The sleeve 103 is provided with a protrudingoperating arm 106 carrying a pivot pin 107 on which there is connected a cable anchor piece 108 (Fig. 1) to which an operating cable 109 is connected. The cable is supported on a guide 110 clamped by a cap 111 and screws 112 to the upper end of a bracket 113 secured to the side of ange 41 by cap screws 114. The necessary openings and clearance space are provided for the accommodation of the emerging cable and protruding parts.

Figs. 13 to 15 show a modified form of hand parking brakeA in which a ball cam plate 104 is mounted beneath a cap 117 which is secured to the Uframe 49 by cap screws 118. A number of cam balls acting against ramp races in the cap and plate produce an inward movement of the plate. The plate bears on a shoulder of a pressure pin 119 whichforces the trailing cam ball 61' against the cam race on the inner shoe 51' to apply the brakes.

An operating arm 106' turns the cam plate 104 to apply the brakes, a cable, not shown, being connected thereto',` as before. The action is easy because of the low friction produced by the cam balls is very small and there is' no danger of locking. the parts in brake-applied condition.

It is to Vbe noted that while there is uniform movement at both ends ofthe shoes andl equal automatic adjustment, it is possible to make separate adjustment for either shoe at the two ends initially or at any desiredl time'. The inner shoe can be so adjusted by merely turning the backing screw 62; the outer shoe can be adjusted by backing off the assembly of the' friction clutch consisting of 82, S3, 85, 86, and 87 and by removing spring 91 from the post;

of cam 90. This will allow the complete assembly to be retracted in the case of the cover,.thereby disengaging the central gear 82 from idler gears 81. From Figs. 9 and 11 it can be seen that there is* room within the case to provide the necessary retracting movement to disengage gear 82 from gears 81. Then each screw and gear assembly 57 and 80 can be adjusted independently of each other. After adjustment is made theV friction clutch assembly is brought back into its proper position with gear 82 in engagement with idler gears 81. Then spring 91 is replaced on post to hold the' parts in position.

It is seen that the invention provides a' simple, economical, dependable disk brake assembly which can be easily adjusted initially andv whielithereafter adjusts automatically and evenly at both ends ofA the shoes. The arrangement for engaging the trailing end of the shoes slightly ahead of the front end makes for easy quiet application. The mounting is simple and sturdy and readily installedor removed.

While one embodiment has been described for purposes of illustration, it is to be understood that there may be various embodiments and modifications within the limits of the invention.

What is claimed is:

l. A disk brake assembly, especially for automobiles, comprising in combination, a rotary brake disk,I axially movable shoes cooperating with the outer opposite surfaces of said disk, backing means acting on said shoes at circumferentially spaced points to apply them to the disk, means acting conjointly and simultaneously on said backing means of at least one shoe to adjust the shoes evenly together at both ends, and means actuated by the movement of said shoes for adjusting the axial position of the shoes relative to the disk, said adjusting means including a pivoted lever extending across the disk.

2. A disk brake assembly, especially for automobiles, comprising in combination, a rotary brake disk, axially movable shoes cooperating with said disk, one of the shoes also having' limited circumferential movement, backing means acting on said shoes at circumferentially spaced points to apply them `to the disk, means acting conjointly and simultaneously on said backing means of at least one shoeto adjust the shoes evenly together at both endsj, said adjusting means including spaced backing screws fora shoe,.turning1means on the screws, and means responsive to relative movement between the shoes for turning said screws by equal amounts in unison.

3. A disk brake assembly, especially for automobiles, comprising in combination, a rotary 'brake disk, axially movable shoes cooperating with said disk, one of the shoes also having limited circumferential movement, backing means acting on said shoes at circumferentially spaced points to apply them to the disk, and means acting conjointly and simultaneously on said backing means' of at least one shoe to adjust the shoes evenly together at both ends, said adjusting means comprising spaced backing screws for a shoe, and means responsive to relative circumferential movement between the shoes for turning said screws by equal amounts together.

4. A disk brake assembly, especially for` automobiles, comprising in combination, a rotarybrake disk, axially movable shoes cooperating with said disk, one of the shoes also having limited circumferential movement, backing means acting on said shoes' at circumferentially spaced points to apply them to the disk, means acting coujointly and simultaneously on said backing means .ofy at least one shoe to adjust the shoes evenly together at both ends, said adjusting means comprising spaced backing screws for a shoe, a one-way turning ratchet device connected to both screws, a ratchet arm for operating said turning ratchet device, a lever pivoted between ,the shoes having one end operatively associated with said arm and the other end disposed adjacent a brake shoe, and means on said brake shoe for operating theA arm when` the brakes are' applied, overtra'vel'beyond normal due to brake-wear causing take-up by said screws on the associated brake shoe.

5. A disk brake assembly, especially for automobiles, comprising in combination, a rotary disk open on the nside, a support mounted within the disk opening, a tiltable U-frame pivoted to said support on an axis lying within the plane of said disk, axially movable brake shoes mounted on said U-frame in position to act against axially opposite radial surfaces of said disk, axially movable mounting means for a rst one of said shoes comprising circumferentially spaced backing screws carried by the U-frame, gears on said screws, a common adjusting ratchet device operatively geared to said screw-mounted gears, an operating ratchet arm for said ratchet device, a lever pivoted between shoes on said U-frame having one end engageable with said arm and the other end engageable with a turning element carried by the other one of said shoes.

References Cited in the file of this patent UNITED STATES PATENTS Ragsdale et al. Feb. 5, Lambert June 17, Driscoll Ian. 2, Du Bois May 1, Hawley Oct. 7, Hawley Oct. 21, Freer June 23, Eksergian Oct. 13, Brisson Feb. 7, Butler May 22, Butler Oct. 30,

FOREIGN PATENTS Australia Feb. 24, France Oct. 4, Great Britain Mar. 24, 

